NEETBotanyBiomolecules (B)
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): During the catalytic cycle, the active site of the enzyme breaks the chemical bonds of the substrate. Reason (R): The binding of the substrate induces the enzyme to alter its shape, bringing the active site in close proximity to the substrate. In the light of the above statements, choose the correc
Options
- A(A) is false but (R) is true.
- B(A) is true but (R) is false.
- CBoth (A) and (R) are true but (R) is not the correct explanation of (A).
- DBoth (A) and (R) are true and (R) is the correct explanation of (A).
Correct answer
D. Both (A) and (R) are true and (R) is the correct explanation of (A).
Step-by-step solution
Assertion (A) is true. In the catalytic cycle, the active site of the enzyme breaks the chemical bonds of the substrate to form the new enzyme-product complex. Reason (R) is true. The binding of the substrate induces the enzyme to alter its shape (induced fit), fitting more tightly around the substrate. Reason (R) is the correct explanation for Assertion (A). It is precisely this induced alteration in shape that brings the active site into close proximity with the substrate, enabling it to effectively break the che